That's a really tough question. I love black, death, doom, stoner/sludge but some of my favorite music of all time is from the Nowregian black metal scene of the early-to-mid 1990's, so I guess black.
But I'd have to rank them:
11/01 - Suffocation
11/30 - Devin Townsend
12/06 - Distant Worlds: the Music of Final Fantasy
03/07 - Video Games Live